(wip) github actions

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: Checks
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: oven-sh/setup-bun@v1
+        id: setup-bun
+      - name: Cache node_modules
+        uses: actions/cache@v3
+        with:
+          path: node_modules/
+          key: ${{ runner.os }}-${{ steps.setup-bun.bun-version }}-node-modules
+      - name: Install deps
+        run: bun install
+      - name: Typecheck
+        run: bun run typecheck
+      - name: ESLint
+        run: bun run lint
+      - name: Check formatting
+        run: bun run fmt-check